The decision by a Danish zoo to kill a giraffe named Marius sparked outrage around the world. Copenhagen Zoo officials said they had to euthanize the healthy two-year-old giraffe because it was genetically too similar to other giraffes at the zoo and the zoo wanted to prevent inbreeding.

There is no more beautiful sound than the voices of siblings swirled together in high harmony, and when Phil and Don Everly combined their voices with songs about yearning, angst and loss, it changed the world.